Lewis D. Collins (Director) · Ray Taylor (Director) · Dwight V. Babcock (Story) · Jack Natteford (Story) · Joseph O'Donnell (Screenplay) · George H. Plympton (Screenplay)
Milburn Stone
Agent Tom Brant
Jan Wiley
Janet Lowe
Dennis Moore
Jack Ryan
Addison Richards
Gerhard Doenitz / Garret Donahue
Byron Foulger
Prof. Elwood Henderson
Maris Wrixon
Dorothy Newton
Sarah Padden
Aggie
George Lynn
Herman
Russell Hicks
Police Chief Michael J. O'Brien
Roland Varno
Arnold Hoffman
Lash LaRue
Migsy
Jerry Shane
Dan
Neyle Morrow
Spike
John Eldredge
Walter Stark
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Before the outbreak of WWII, Nazi sympathizers plot to undermine America.
